18223173 has 12 divisors (see below), whose sum is σ = 26410540. Its totient is φ = 12108096.

The previous prime is 18223159. The next prime is 18223181. The reversal of 18223173 is 37132281.

It can be written as a sum of positive squares in 2 ways, for example, as 431649 + 17791524 = 657^2 + 4218^2 .

It is not a de Polignac number, because 18223173 - 2⁴ = 18223157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18223193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 418 + ... + 6051.

Almost surely, 2^18223173 is an apocalyptic number.

It is an amenable number.

18223173 is a deficient number, since it is larger than the sum of its proper divisors (8187367).

18223173 is a wasteful number, since it uses less digits than its factorization.

18223173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6788 (or 6785 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 18223173 is about 4268.8608550760. The cubic root of 18223173 is about 263.1528024327.

The spelling of 18223173 in words is "eighteen million, two hundred twenty-three thousand, one hundred seventy-three".